update man pages - merchant - Merchant backend to process payments, run by merchants

commit f3094bd498d23d5db74ece49fa0aab8c7258c447
parent ef5b2ce8c4ae3b66f141e4443ed190983e8c3b0c
Author: Christian Grothoff <christian@grothoff.org>
Date:   Fri,  8 Sep 2023 20:15:02 +0200

update man pages

	merchant Merchant backend to process payments, run by merchants
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